CARDURA

AbsorptionAfter oral administration of therapeutic doses, peak plasma levels of CARDURA occur at about 2-3 hours. Bioavailability is approximately 65%, reflecting first-pass metabolism of doxazosin by the liver. The effect of food on the pharmacokinetics of CARDURA was examined in a crossover study with twelve hypertensive subjects. Reductions of 18% in mean maximum plasma concentration (C max ) and 12% in the area under the concentration-time curve (AUC) occurred when CARDURA was administered ...

14.1 Benign Prostatic Hyperplasia (BPH) The efficacy of CARDURA was evaluated extensively in over 900 patients with BPH in double-blind, placebo-controlled trials. CARDURA treatment was superior to placebo in improving patient symptoms and urinary flow rate. Significant relief with CARDURA was seen as early as one week into the treatment regimen, with CARDURA-treated patients (N=173) showing a significant (p<0.01) increase in maximum flow rate of 0.8 mL/sec compared to a decrease of 0.5 mL/sec in the placebo group (N=41). In long-term studies, improvement was maintained for up to 2 years of tr...

The most commonly reported adverse reactions from clinical trials are fatigue, malaise, hypotension, and dizziness. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Viatris at 1-877-446-3679 (1-877-4-INFO-RX) or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of anoth...

The use of CARDURA is contraindicated in patients with a hypersensitivity to doxazosin, other quinazolines (e.g., prazosin, terazosin), or any of its components.

• Hypersensitivity to doxazosin, other quinazolines, or any other ingredient in CARDURA. ( 4 )

• Postural hypotension with or without syncope may occur. ( 5.1 )
• Risk of Intraoperative Floppy Iris Syndrome during cataract surgery. ( 5.2 )
• Screen for the presence of prostate cancer prior to treatment for BPH and at regular intervals afterwards. ( 5.3 ) 5.1 Postural Hypotension Postural hypotension with or without symptoms (e.g., dizziness) may develop within a few hours following administration of CARDURA. However, infrequently, symptomatic postural hypotension has also been reported la...

7 DRUG INTERACTIONS

• Strong cytochrome P450 (CYP) 3A inhibitors may increase exposure to doxazosin and increased risk of hypotension. ( 7.1 )
• Concomitant administration of CARDURA with a phosphodiesterase-5 (PDE-5) inhibitor can result in additive blood pressure lowering effects and symptomatic hypotension. ( 7.2 ) 7.1 CYP 3A Inhibitors In vitro studies suggest that doxazosin is a substrate of ...